Behavior of after/watch not as expected

[ElMagic1980]

Hello,

i am trying to fetch a simple pressed button but doesn't work as expected.

I am using pi_piper 2.2.2.

I tried the following:

after :pin => 21, :goes => :high do puts "Button pressed" end
The result was that it was prompted "Button pressed" the whole time until i pressed the button. when releasing the button it started prompting again.

The same happend when i tried :goes => :low

I tried the rpi_gpio gem

RPi::GPIO.setup 21, :as => :input, :pull => :down print RPi::GPIO.low? 21
Here was the result correct.

I have tried following different options:
GPIO21 (Pin 40) connected to GND/3.3V
Watch/Wait functions used
Try to initialize Pin first with parameters :pin => 21, direction => in, :pull => :down (Had no idea how to use der created Pin object in the watch or wait context because there you can use only pin numbers)

I am clueless how to use the library the right way :-(

Any ideas what is wrong with my Code?

Thanks

Regards Elmar

[thib44]

Hello,
I had the same issue, and that's work for me :

require 'pi_piper'
include PiPiper


puts "Press the switch to get started"

PiPiper.watch :pin => 16, direction: :in, pull: :up do |pin|
  puts "Pin was pressed"
end

PiPiper.wait

But when i press the button, it give me 2 times Pin was pressed